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A leakage protector

A leakage protector and leakage protection technology, applied in emergency power supply protection, protection switch, protection to fault current, etc., can solve problems such as failure of leakage protectors, achieve short power-on time, stable power supply voltage Vcc, The effect of rapid rise in supply voltage Vcc

Active Publication Date: 2018-06-12
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the power supply voltage Vcc is lower than 12V, the internal latch of the chip will be disconnected, and the circuit of the chip will stop working, causing the leakage protector to fail

Method used

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  • A leakage protector
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Embodiment Construction

[0021] figure 2 An example shows a leakage protector according to an embodiment of the present invention. exist figure 2 in, with figure 1 Similarly, the leakage protector includes a rectifier circuit M1, a surge protection circuit M2, a trigger circuit M3, an overvoltage protection circuit M4, a voltage stabilizing circuit M5, a sampling circuit and a leakage detection circuit (the latter two are the same as figure 1 same in figure 2 not shown).

[0022] Such as figure 2 As shown, the rectifier circuit M1 preferably includes a half-bridge rectifier bridge composed of diodes D6, D7, D8, D9, and D10. The rectifier circuit M1 is connected to the phase line L, the neutral line N and the grounding protection line PE in the power supply line of the power distribution system, and is used for half-wave rectification of the current from the power supply line. Optionally, the rectification circuit M1 may also use a full-bridge rectification circuit.

[0023] The surge protec...

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PUM

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Abstract

A residual current protection device comprises a leakage detection circuit, a trigger circuit M3 and a voltage stabilizing circuit M5 providing a stable supply voltage Vcc to the leakage detection circuit, the stabilization circuit M5 having a capacitor C2 for storing electrical energy and providing a voltage Vcc and a charging control circuit M51 that causes the power line L to charge the capacitor C2 when Vcc is equal to or less than a predetermined threshold and stops the charging when Vcc exceeds the threshold. The charging control circuit M51 may comprise a controlled switch Q1 in series with the capacitor C2 and a voltage clamping element D5, wherein the switch Q1 is turned on when the voltage difference between the clamping element D5 and the capacitor C2 exceeds its turn-on voltage. The switch Q1 may be a MOS transistor and the clamping element D5 may be a zener diode, the cathode of which may be connected to the gate of the switch Q1. The turn-on voltage of the clamping element D5 may be higher than that of the switch Q1.

Description

technical field [0001] The invention relates to a residual current protection device (RCD), in particular to a voltage stabilizing circuit in the residual current protection device. Background technique [0002] The residual current device (RCD) is a widely used circuit protection device, which is used to instruct the circuit breaker S to cut off the power supply of the distribution system to the electrical equipment when the equipment has a leakage fault, so as to prevent the occurrence of electric shock accidents. The structure of the leakage protector in the prior art is as figure 1 As shown, it includes: rectification circuit 1, surge protection circuit 2, trigger circuit 3, overvoltage protection circuit 4, voltage stabilization circuit 5, leakage detection circuit 6, current sampling circuit 7, and current transformer (transformer for short) ZCT. The rectification circuit 1 is connected to the phase line L, the neutral line N and the grounding protection line PE of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/32H02H1/06H02M3/07
CPCH01H83/144H02H1/066H02H3/16H02H1/06H02H3/331H01H83/14
Inventor 杨林汪小妹刘华雷
Owner SIEMENS AG